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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.142 SNIP: 0.16 CiteScore™: 0.29

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.v3.i1-6.230
pages 227-240

TEMPERATURE AND CONCENTRATION MEASUREMENTS IN HOSTILE COMBUSTING FLOWS USING MULTICHANNEL ABSORPTION SPECTROSCOPY

J. A. Vanderhoff
U.S. Army Research Laboratory, Attn: AMSRL-WT-PC, Aberdeen Proving Ground, MD 21005
Anthony J. Kotlar
US Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005-5066, USA
R. A. Beyer
U.S. Army Research Laboratory, Attn: AMSRL-WT-PC, Aberdeen Proving Ground, MD 21005

ABSTRACT

Multichannel absorption spectroscopy has been used to determine simultaneously the temperature and absolute species concentrations in the gas-phase flame above solid propellant samples burning at pressures from 0.1 to 2.0 MPa. The apparatus consists of a windowed chamber, broad-band arc lamp and two 0.32-m spectrometers with intensified photodiode array detectors. Pinhole apertures, 0.1 and 0.2 mm in diameter, were mounted near the propellant samples to define the spatial resolution. Typically, 30 spectra were recorded during a propellant burn. Details of the analysis that account for the significant wavelength nonlinearity which is present in the data are given.
Sample spectra and analysis fits are presented for OH and NO from both laboratory flames and propellant burning at elevated pressures. Plots of the measurements of both the temperature and absolute concentrations of OH and NO as functions of distance from the surface of a sample propellant are presented. Measured mole fractions are as high as 0.20 for NO in the dark zone and 0.002 for OH in the post-luminous flame zone. Estimated total error in concentration measurements is 30%. Temperature errors are indicated to be 50 K from data fits and 100 K based on comparison of OH concentrations observed vs. those calculated thermochemically.


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